In 1939 Walter returned to Switzerland where he initially was hired as an employee of the advertising department of the Maggi company in Kemptthal (and end of 1940 in Basel).In August 1939 Ruedi Walter was drafted on occasion of the mobilization of the Swiss Army to perform military service during World War II.In addition, Walter worked from 1969 to 1985 under the direction of Jörg Schneider in several children's fairy tales and musicals at the Bernhard-Theater Zürich,[4] where in 1980 Walter played alongside Jörg Schneider in the Swiss German adaption Warte uf de Godot (Waiting For Godot).[8] After Margrith Rainer's death, Walter toured from 1983 to 1985 with "Drei Männer im Schnee" and in Mary Chase's "My Fründ Hanspi" (Swiss German version of Harvey).He sat always for professional dialect theater and appeared in numerous vernacular versions of modern dramas, including as Karl Knie in Jörg Schneider's dialect edition of Carl Zuckmayer's "Katharina Knie" in 1985 in a circus tent at Zürichhorn, and in the title roles of television adaption of Molière's The Miser and The Imaginary Invalid.